Wireless apparatus



Nov. 8, 1927.

L. R. RUQFF WIRELESS APPARATUS 2 Sheets- Sheet 1 Filed Jan. 11, 1923 myg? B NToRNEYS.

Nov. 8, 1927. 1,648,592

L. R. RUOF F WIRELES S APPARATUS Filed Jan. 1l, 1923 2 Sheets-Sheet 2 Nov. 8, 192'?.

UhllTED STATES Parent orsi wan-fie NEW' YORK,

GF ONE-EGURTH T HOl/ARD ."{GMEShL RUTH OF SYRACUSE,

WIRELESS .AP'ARATU Application filed January 11, i923. Serial No. 611,98.

rllhis invention relates to a certain new wireless apparatus, and is at present more speciiically adapted to the improvement of wireless receiving apparatus.

The main object the invention is to produce more et'icient wireless receiving ap paratus, and l lind from tests oitI the apparatus hereinafter described that it allows oit the use oi the full capacity o' the tube without permitting it to reach the stage ot audible oscillation. t is found that received and rectiiied oscillations or those made audible in the telephones or other instrument ot delivery or translating devices may be fed through any added amplification in such a way that signals are not distorted thereby making possible any degree of ampliication at audible frequencies, a condition which has not hereto'tore been obtainable.

The apparatus is capable et producing received signals that can be amplilied to any extent desirable without becoming mushy or distorted. i

Further, the tube emits no foreign noises such as hissing, popping or trying' noises, these being eliminated or reduced, when properly tuned, to such an extent as to be imperceptible even under a large amount of amplification, with theresult that clear sig! nals are produced.

Further, the operation of the apparatus permits oit a very high degree of selectivity, thereby reducing interference caused i'or instance by broadcasting stations on very nearly the same wave length at the point oit reception. Y

Further, the ajgiparatus is extren'iely simple to tune.

Other objects and advantages relate to the details oil construction o'l the apparatus and the arrangement of the parts thereof, all as will more fully appear from the Jjollowing description taken in connection with the accompanying drawings, in which Figure l is a diagrammatic illustration ot' an embodiment of my invention.

Figure 2 is a diagrammatic illustration ot' a tur-ther embodiment of my invention involving added amplilication.

The apparatus as shown, comprises an antenna 1 connected to the ground 2fthrough a variable inductance 3we and a variable capacity such as the condenser -l The grid 5* of the vacuum tube G- is connected in circuit lwith the antenna -lat a point between the antenna -land the variable inductance r3- through the two condensers -7- and `8*. The iilament -9 ot the tube timay be heated in any suitable manner as by battery --lO connected in circuit with the iilament such circuit preferably including an adjustable resistance, such as the rheostat -ll-. The negative side ot the filament --9n is connected to the ground circuit of theA antenna -lbetween the variable inductance 3q and the capacity -Ll-. The positive side oitl the ila rent -9 is connected in circuitI with the plate -l2- oi the tube -6*, such circuit including a source ct' potential which is preferably variable, such as the battery `l3-, a translating device such as the telephone receivers lll preferably having a condenser in shunt therewith, and an inductance -l6-. Preferably the iilamentplate circuit contains a source o t potential such as the battery -l3` of about 18 to 221/2 volts.

The positive side of the filament -9- is connected to the antenna ygrid circuit at a point between the condenser -7- and the condenser `S by means oit a circuit which contains a source of potential. which may include the battery -l3- of the :Filament plate circuit, together with an added potential which in eliect is found to increase the amplification produced by the zqJparatus.

My efviperiments at present indicate that lthe Vlilanxent plate circuit as above stated, is most etl'ective under i8 to volts, while the third circuit which tapped into the antenna grid circuit and is connected to the positive side oit the lilament 9 is most eli'ective under a voltage of 7() to 9() volts dependent upon the character of the vacuum tube used. The source ol potential oi' the circuit -l7- may, as above stated, include all or any portion ot the source of potential used in the filament plate circuit or may be an entirely independent source of potential.

rIhre circuit W17- further includes a variable inductance -l8- variably coupled to the inductance -l6- in the iilament plate circuit and the variable inductance -18- is provided with a variable condenser i9- in shunt therewith. The audio grid circuit is provided with a grid leak in the form of non-inductive high resistance -20- in shunt With the condenser -8-.

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The plate w25- is connected in circuit with the iiiauient -Q}-, sucn circuit including a tinnslatingl device, such as the telephones -9/.7- and the battery l.3-. The circuit li-M in iile manner as heretotore de scribed is connected to the positivo side ot' lilanient m23* by tapping into the circuit between the plate and the if'lanient -28- or by direct connection through a suitable source of potential.

Any further ai'ngliiication desired may be eilected in the saine marmer as here illustti-ated by the use ot further electron di."- cliargedevices Q? additionally coupled in the manner here illustrated. T he exact i'netliod of operation or the apparatus herein L present uliy described is not at l-inovvn or understood, and any statement as to the reasons Why the improved results described. are eiiected would be largely a. matter oit speculation and the disclosure ot this application is, therefore, limited to a description o'i the apparatus, and certain of the at vantages attained thereby Without advancing any theory as to the reasons Why those advantages are attained.

Altho l have shoivn a preferred construction in that the grid #-5- and the iilament 9 are directly connected to the antenna ground circuit, it should be understood that that connection is deemed a substantial equivalent t'or that in which the inductance -3- is utilized as the primary of a transformer and the grid and the filament --9- are connected upon opposite sides ot' the secondary of suoli traust'orrner, and claims calling for the connection of the grid to the antenna circuit are deemed to include the substantial `equivalent in the connection of such grid to the secondary ot such transformer.

A ltho I have shown and described specific constructions of apparatus as illustrative ot embodiments ot my invention7 I do not desire to limit myself to the details of the apparatus or the parte thereof` except as the suine .may be spccically failed lor in the ciaiins hereto appended.

I claim: i

l. A Wireless receiving apparatus co1nprisiug an electron discharge device, a grid iilainent circuit upon which the received oscillations are impressed, a plate tilanient circuit containing source ot potential and an inductance, and an additional circuit connecting theti'ilament grid circuit to the iilanient plate circuit at a point between the plate and the source of potential, said third circuit containing an inductance coupled with the first-named inductance.

Q. A wireless receiving` apparatus coin prising an electron discharge device, a grid iilaincnt circuit upon which the treceivedi oscillations are impressed, a plate Vfilament circuit containing a source ot'potential and an inductance, a condenser in the iilament grid circuit and a third circuit connecting the filament grid circuit at a point between the said condenser and the grid, to the plate filament circuit on the positive side of said source of potential, said third circuit containing an inductance coupled with the firstnained inductance.

In witness whereof I have hereunto set my hand this 5th day of January, 1923.

LEROY R. RUOFF. 

